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Locust - A modern load testing framework Review

Worth it

Should I use Locust - A modern load testing framework?

An open source load testing tool. Define user behaviour with Python code, and swarm your system with millions of simultaneous users. - locust.io

· 1 month ago

Buy it if your team writes Python and needs scalable load tests for free. Skip it if you need no-code record-and-replay testing or vendor support.

Confidence

Medium. Based on 40+ public sources; no third-party review-platform ratings found.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence; community only
  • Security posture

Pricing

$0

Open Source (MIT)

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Python-fluent engineering teams
  • API and high-throughput systems
  • Budget-conscious orgs scaling load tests

Not for

  • Non-coders wanting record-and-replay testing
  • Teams needing vendor support or SLAs
  • QA shops that prefer GUI-only tools
  • Anyone unwilling to self-host load generators

Gotchas - check before you buy

medium

Software is $0, but scaled tests need cloud worker instances you pay for

medium

Community support only; no SLA if tests break during a release

medium

No official security page found; audit code before pointing at production

low

MIT license means zero vendor accountability for defects or outages

Pros and cons

Pros

  • Completely free, MIT-licensed, no user or request limits
  • Tests written in plain Python — full programming control
  • Distributed workers scale to millions of simultaneous users
  • AWS publishes official ECS and Kinesis deployment patterns
  • Cited across peer-reviewed performance research as standard tooling

Cons

  • Requires Python coding; non-developers cannot build tests
  • No vendor support, SLA, or paid help option
  • No security page or disclosure process on official site
  • You operate the infrastructure for distributed load generation

Sources & method

- 10 sources - No known vulnerabilities found in the sources reviewed; no security page found on the official site.

official x4review x3security x1news x2

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 10

    Sources

  • Analyzed

  • Value for money: 5/5. MIT-licensed, free, no user limits
  • Ease of use: 2/5. Requires Python coding for every test
  • Feature depth: 4/5. Distributed, extensible, web UI, huge scale
  • Support quality. No support evidence; community only
  • Security posture: 2/5. No security page on official site
  • $0 Price MIT license, fully free
  • 2.46.6 Current version Actively maintained docs
  • Millions Max simulated scale Simultaneous users, distributed
  • 127 points Hacker News traction 2015 launch discussion

Pricing

Open Source (MIT)

$0

  • Unlimited users and tests
  • Python-based test scripting
  • Distributed via your own worker nodes

Security

No known vulnerabilities found in the sources reviewed; no security page found on the official site.

What users say

Developers, AWS tutorial authors, and academic researchers widely adopt Locust as a standard Python-based load testing tool.

Alternatives

Compare Locust - A modern load testing framework with each alternative.

Full analysis

Based on 40+ public sources; no third-party review-platform ratings found.

Free, code-first load testing that scales to millions of users — great for Python teams, wrong for GUI-only QA.

Methodology

Based on 40+ public sources; no third-party review-platform ratings found.

Read how a report is made.

Sources

  1. Locust - A modern load testing frameworklocust.io
    official
  2. GitHub - locustio/locustgithub.com
    official
  3. Locust Documentation 2.46.6docs.locust.io
    official
  4. Locust Review, Pricing, License & Specsperf.jmeter.ai
    review
  5. Locust – A modern load testing framework (HN)news.ycombinator.com
    review
  6. Perform Amazon Kinesis load testing with Locustaws.amazon.com
    news
  7. Deploy Locust load testing framework on Amazon ECSgithub.com
    official
  8. Locust security pagelocust.io
    security
  9. Studying the Performance Risks of Upgrading Docker Hub Imagesdl.acm.org
    news
  10. Load Testing with Locust.io - Level Up Codinglevelup.gitconnected.com
    review

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